Generally speaking, an application can be submitted to the local electric power bureau for project filing before the installation of the power station starts. After the project is completed, confirm the grid-connected system plan according to the requirements of the grid staff, perform grid-connected acceptance, replace the meter, and sign the power purchase agreement, and then the grid-connected power generation can be completed and revenues will begin.
The process of grid-connected solar photovoltaic power generation is as follows:
1. Call 95598 to apply
2. Submit the application materials of "Distributed Photovoltaic Power Generation Project Grid Connection Application Form" and "Project System Design and Implementation Plan", and the State Grid will officially accept the application. After acceptance, the local power supply bureau will conduct on-site inspections of the project location.
3. Develop an access plan. According to the owner's project situation, State Grid will issue a project grid connection plan.
4. Confirm the access system plan. Apply for grid-connected owners to review and confirm the access system plan.
5. Issue a letter of opinion on connection to the Internet. Owners applying for grid connection get a grid connection opinion letter issued by the grid.
6. Project approval and project construction. The owner completed the construction of photovoltaic panels and other projects.
7. Submit an application for grid connection acceptance and commissioning. The owner fills in the "Application Form for Acceptance and Commissioning of Distributed Photovoltaic Power Generation Projects".
8. Accept the acceptance and commissioning of grid connection. State Grid will visit the owner’s project for acceptance, replace the meter, and sign an electricity purchase agreement with the owner.
What documents do I need to bring for photovoltaic grid connection?
It is usually recommended to call 95598 for consultation. The documents required in each region may be different. Generally speaking, for rural users, they should bring homestead property certificate, ID card, household registration book, bank card, official seal of the village committee, and township. The official seal of the government can be proved by filling out the application form at the town power supply station; users in the urban area may be more complicated. In addition to their own certificates, more users living on the same floor and the residents’ committee and other government departments’ certification documents are required to fill in at the power supply company. Application form, or inquire at the power supply company.
For details, please refer to the requirements of the unified format notice issued by the grid company in the following figure:
What are the voltage requirements for installing photovoltaic systems?
Matching of transformer and photovoltaic module
For existing household transformers, the choice of the transformer is related to the total load of the user, and the choice of the transformer should be greater than the total load. If photovoltaic power generation is introduced on the low-voltage side of the transformer, the total installed capacity of photovoltaic power generation should not be greater than 10% to 15% of the total load.
According to the State Grid Corporation’s Technical Regulations Q/GDW617-2011 for photovoltaic power stations to be connected to the grid, the total capacity of small photovoltaic power plants should not exceed 25% of the maximum load in the upper-level transformer power supply area in principle. The total capacity of medium-sized photovoltaic power stations connected to the public grid should be controlled within 30% of the maximum transmission capacity of the connected public grid line.
It is stipulated in the guidelines for the access system of photovoltaic power plants in Jiangsu Province:
Below, Xiaoguang takes Jiangsu Wuxi Power Supply Company as an example to sort out the key points that you must know for the typical design of distributed power access system:
â— Power supply companies compile distributed power access system plans in accordance with relevant national, industry, local and enterprise technical standards, and refer to "Related Technical Specifications for Distributed Power Access to Distribution Networks" and "Typical Designs of Distributed Power Access Systems" Develop an access plan.
â— The reference standards are as follows:
8 kW and below can be connected to 220 volts
8kw～400kw can be connected to 380V
400kw～6000kw can be connected to 10kv
5000kw～30000kw can be connected to 35kv
â— The final grid-connected voltage level will be determined through technical and economic comparison and demonstration based on grid conditions. If both the high and low voltage levels meet the access conditions, the low voltage level access is preferred. When 220V single-phase connection is used, the final power phase of the connection will be determined according to the local power distribution management regulations and the results of the three-phase unbalance measurement.
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